Thanks to its festive colors, this pasta salad will shine bright on your holiday table. For the vibrant green dressing, we jazzed up traditional basil pesto with spinach and almonds. A couple tablespoons of white wine vinegar go into the whole dish for extra tang. The pesto can be made three days ahead and refrigerated in an airtight container.
Bring a large pot of generously salted water to a boil. Fill a large bowl with cold water. Drop the broccoli into the boiling water and cook until crisp-tender and bright green, about 2 minutes. Remove with a slotted spoon and plunge into the cold water to stop the cooking. Let sit until cool, then drain and set aside.
Return the water in the pot to a boil and cook the rigatoni according to the package directions for al dente. Drain in a colander and transfer to a large bowl. Toss the pasta with 2 tablespoons of the olive oil to coat evenly and refrigerate until cooled completely, about 10 minutes.
Meanwhile, add the remaining 1/3 cup olive oil to a blender with the spinach, Parmesan, almonds, basil, lemon juice, chives and 1/4 cup water and puree until completely smooth. Pour the pesto over top of the pasta and add the reserved broccoli, red peppers, sun-dried tomatoes, mozzarella, vinegar and 1 teaspoon salt. Toss gently until well combined. Transfer to a serving bowl and sprinkle with more chopped chives. Cover and refrigerate until ready to serve, up to 4 hours.
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